PYTHON-3909 Fix OIDC reauth for bulk write operations, remove unneeded AUTH_MECH (#1353)

Co-authored-by: Steven Silvester <steven.silvester@ieee.org>

Author: ShaneHarvey

.evergreen/run-mongodb-oidc-test.sh

@@ -51,7 +51,6 @@ if [ -z "$PYTHON_BINARY" ]; then
 fi
 
 export TEST_AUTH_OIDC=1
-export AUTH_MECH="SCRAM-SHA-256"
 export AUTH="auth"
 export SET_XTRACE_ON=1
 bash ./.evergreen/tox.sh -m test-eg

pymongo/helpers.py

@@ -308,6 +308,7 @@ def _handle_exception() -> None:
 def _handle_reauth(func: F) -> F:
     def inner(*args: Any, **kwargs: Any) -> Any:
         no_reauth = kwargs.pop("no_reauth", False)
+        from pymongo.message import _BulkWriteContext
         from pymongo.pool import Connection
 
         try:
@@ -324,7 +325,7 @@ def inner(*args: Any, **kwargs: Any) -> Any:
                     if isinstance(arg, Connection):
                         conn = arg
                         break
-                    if hasattr(arg, "connection"):
+                    if isinstance(arg, _BulkWriteContext):
                         conn = arg.conn
                         break
                 if conn:

test/__init__.py

@@ -95,7 +95,6 @@
 TEST_SERVERLESS = bool(os.environ.get("TEST_SERVERLESS"))
 SINGLE_MONGOS_LB_URI = os.environ.get("SINGLE_MONGOS_LB_URI")
 MULTI_MONGOS_LB_URI = os.environ.get("MULTI_MONGOS_LB_URI")
-AUTH_MECH = os.environ.get("AUTH_MECH")
 
 if TEST_LOADBALANCER:
     res = parse_uri(SINGLE_MONGOS_LB_URI or "")
@@ -278,8 +277,6 @@ def __init__(self):
         self.is_data_lake = False
         self.load_balancer = TEST_LOADBALANCER
         self.serverless = TEST_SERVERLESS
-        if AUTH_MECH:
-            self.default_client_options["authMechanism"] = AUTH_MECH
         if self.load_balancer or self.serverless:
             self.default_client_options["loadBalanced"] = True
         if COMPRESSORS:
@@ -347,7 +344,6 @@ def _connect(self, host, port, **kwargs):
 
     def _init_client(self):
         self.client = self._connect(host, port)
-
         if self.client is not None:
             # Return early when connected to dataLake as mongohoused does not
             # support the getCmdLineOpts command and is tested without TLS.